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96 Rockwell Automation Publication 1783-UM007I-EN-P - December 2017
Chapter 3 Configure Switch Features
Delay Request The logarithmic mean interval in seconds.
Type the recommended to connected devices to send delay request messages when the switch port is in the master state.
Valid values:
• -1—half second
• 0—1 second
• 1—2 seconds
• 2—4 seconds
• 3—8 seconds
• 4—16 seconds
• 5—32 seconds
• 6—64 seconds
Default: 5 (32 seconds)
Announce Timeout Type the number of announce intervals, specified as the logarithmic mean in seconds, that must pass without receipt of an announce message
from the parent or Grandmaster clock before the switch selects a new parent or Grandmaster clock.
Valid values: 2…10
Default: 3 (8 seconds)
Announce Interval Type the time interval, specified as the logarithmic mean in seconds, for sending announce messages.
Valid values:
• 0—1 second
• 1—2 seconds
• 2— 4 seconds
• 3— 8 seconds
• 4—16 seconds
Default: 1 (2 seconds)
Sync Interval Type the time interval, specified as the logarithmic mean in seconds, for sending synchronization messages.
Valid values:
• -1—half second
• 0—1 second
• 1— 2 seconds
Default: 0 (1 second)
Sync Fault Limit Type the maximum clock offset before PTP attempts to reacquire synchronization.
Valid values: 50…500000000 nanoseconds
Default: 50000 nanoseconds
IMPORTANT: We recommend against setting the sync limit below the default (50000 nanoseconds). Use values below 50000 nanoseconds
only in networks with a very high-precision Grandmaster clock. These networks have a critical need to keep very sensitive devices
synchronized.
Table 32 - Boundary Mode (Continued)
Field Description